You should get into the habit of looking at the rendered control for the field so that you can determine how to set it. The ALP Domain column is a dropdown, which makes it a select if it has fewer than 20 values. You need to see what the values are for that
select - hint: it'll be the ID of the lookup value, not the text.

Be careful here, though. If the column ever has 20+ values, it won't be a simple dropdown anymore and your script will break.